iTunes Home Sharing:
- Play music, movies and TV shows from a shared iTunes library on a Mac or PC (requires iTunes 10.2)

New AirPlay features:
- Play videos from the Photos app including the Camera Roll album, iTunes previews, enabled third-party apps and websites on Apple TV
- Play slideshows from Photos on Apple TV using transitions available on Apple TV

Ping features:
- Push notifications for comments and follow requests
- Post and Like songs directly from the Now Playing screen
- Parental controls

New Settings:
- Messages setting for number of times to repeat an alert
- iPad side switch setting to lock screen rotation or mute audio notifications and sound effects
- Single tap conference call dialing with a pause to send a passcode
- Bug fixes

Here's other similar drivers that are different versions or releases for different operating systems: